Bump cap liner



FIG. 1 is a front isometric view of the design;

FIG. 2 is a front view of the design;

FIG. 3 is a side view of the design;

FIG. 4 is a top view of the design;

FIG. 5 is a bottom view of the design; and,

FIG. 6 is a rear view of the design.

The broken lines in the drawings depict portions of the bump cap liner that form no part of the claimed design. 

CLAIM The ornamental design for a bump cap liner, as shown and described. 